Steam-boiler furnace.



Patented Ian. 24, I902.

T., a. m-Acv. STEAM BofILEB FURN'AQE.

(Application filed Mar. 23, 1901.)

2 Sheets-Sheet I.

(No Model.)

No. 69l,398. Patented Ian. 2|, I902.

T. a: mAcY. STEAM .BUILER FURNACE. (Application filed Mar. 23 1901.) (NoModel.) 2 Sheets-Sheet 2,

' wax/ 4 UNITED STATES PATENT OFFICE.

THOMAS e. MAcY, or NEW YORK, N. Y.

STEAM-a-BO IL ER FURNACE.

SPECIFICATION forming part of Letters Patent No. 691,398, dated January21 1902.

Application filed March 23, 1901. Serial No. 525513. (llo model.)

To all whom it may concern:

Be it known that I, THOMAS G. MACY, a citizen of the UnitedStates,residing at New York, borough of Manhattan, county and State ofNew York, have invented certain new and useful Improvements inSteam-Boiler Furnaces, of which the following is a specificasupplied bymeans of a suitable blower and having communication with one'or moreparts of the furnace for drawing in the unconsumed combusible gases fromthe furnacespace in rear of the bridge-wall and from the forward end ofthe smoke-fines of the boiler and injecting said unconsumed gases intothe fire-box and combustion-chamber of the furnace together with the airfrom the blower with which the gases are intimately mixed, so that theintimate mixture of said combustible gases and air will be consumed bythe fire. The result of this arrangement will be the more perfectcombustion of the fuel-and the prevention of smoke.

More specifically, my invention consists in a peculiar construction ofinjector for effecting the above-stated result. 1 provide upon the sidesof the fire-box of the furnace and upon the sides of the ash-pit doubleconduits for the passage, respectively, of the currents of air from theblower and for the passage of the smoke and combustible gas drawn infrom the different parts of the steam-boiler furnace, and from thesedouble conduits at various points I provide injectors formed of asbestosand fire-clay. The injectors are arranged to direct the commingled airand combustible gases into the tire from beneath and above the grate.

In order that my invention may be fully understood, 1 will firstdescribe the same with reference to the accompanying drawings and willafterward point out the novelty with more particularity in'the annexedclaims.

In said drawings, Figure 1 is a vertical longitudinal sectional view ofa steam-boiler furnace equipped with my improvements. Fig. 2 is a detailhorizontal sectional View of the fire-box and combustion-chamber of thefurnace. Fig. 3 is an enlarged detail horizontal sectional view of thefire-brick conduit and gas-conduit and one of the injectors. Fig. 4 is adetail front view of one of the injectors.

1 is a steam-boiler having the usual smokeflues (not shown) supported ina furnace of any suitable construction, of which 2 is the fire-box,having door 3. 4 is theash-pit, having door 5. 6 is the bridge-wall. 6is the combustion-chamber. 7 is the space leading to theboiler-fiues,and 8 is the smoke-chamber, into which the boiler-flueslead at the forward end of the furnace. v

Arranged on each side of the fire-box 2 and combustion-chamber 6 of thefurnace is an [upper flue orrconduit 10, formed of vitrified hollowbrick. This flue or conduit 10 is located above the bridge-wall andcommunicates at 'its forward end with the intake branch pipe 11 of ablower-pipe 12, leading from a blower 13 of any suitable constructionlocated above the smoke-chamber 8. 14. is a valve in the branch pipe 11for controlling the supply of air to the conduit 10 from the blower.

Arranged between the upper conduit 1 0 and the fire-box of the furnaceis a conduit 15 for the passage .of smoke and combustible gases. Thisconduit 15 has an intake-opening at 16, covered by a suitable screen toprevent the passage of soot and dirt. The intake-opening 16 is locatedin the combustionchamber 6* between the bridge-wall of the fire-box andthe furnace-dues. The conduit 15 also has a vertical branch 17 leadingfrom the smoke-chamber 8 at the forward end of the boiler, the open endof said branch 17 being covered by a suitable screen 19 to prevent thepassage of soot and dirt.

Extending from the air-conduit 10 inwardly A have contracted ends 20,fitting snugly in openings in the conduits 10. The injector pipes ortubes 20 extend across the conduit and into the side walls of thefire-box, and they are surrounded within the side walls by rectangularpipes or tubes 25, integrally connected with the pipes by webs 26 andforming around the pipes 20 passage-ways 27 in the side walls for thepassage of the smoke and combustible gases drawn through the conduit 15.

Arranged beneath the fire-box 2 in the side walls of the ash-pit 4 arethe injectors 30, communicating with the lower air-conduit 10, connectedat its forward end to the branch air-supply pipe 31, having acontrolling-valve 32 and leading from the blower supply-pipe 12. Theinjectors 30 have communication with a lower air-conduit 35, leadingfrom an intake 36, covered by a screen and located at a point behind thebridge-wall 6 for the purpose of drawing from the combustion-chambercombustible gases in the same manner as above explained in connectionwith the injectors which lead to the fire-box and combustionchamber.

The operation of my improved furnace will be clear with but slightexplanation. Then the furnace is operating, a blast of air is suppliedfrom the blower 13 to the branch supply-pipes 11 and 31 and the pipes orconduits 10 and 10. The air-blasts pass through the injector pipes ortubes into the fire-box and combustion-chamber or beneath the gratebars,as the case maybe, and create a suction in the gas-supply conduits 15and 35, into which the combustible gases are drawn from thecombustion-chamber and from the smokechamber 8. The combustible gases sodrawn in are intimately mingled with the blasts of air and the mixtureof air and combustible gases is injected into the fire, where it iseifectively consumed.

The lower series of injectors located in the side walls of the ash-pitare used only when it is desired to have a forced draft for the furnace.

A very important feature of my invention is the construction of theinjectors of asbestos and fire-clay and the construction of the conduitsof fire-brick, whereby the life of the structure is prolonged. Theimportance of my invention depends upon the well-recognized fact thatthe more intimate themixture of air or oxygen with the combustible gasesof a fire the more nearly perfect will be the resulting combustion.

Having thus described nay-invention, the following is what I claim asnew therein and desire to secure by Letters Patent- 1. The combinationof a furnace comprising a bridge-wall, a fire-box, a combustion-chamber,side walls, having gas-conduits, and intakes to the gas-conduits at thecombustionchamber in rear of the bridgerwall, air-conduits located inthe gas-conduits, and series of transverse injectors formed with outertubes fitting in openings in the side walls of the furnace with innertubes extending across the gas-00nd nits and partly through the outertubes leaving commingling-spaces at their outer ends with contractedinner ends fitting in openings in the air-conduits, and with webssupporting the inner tubes in the outer tubes, ablower and pipesconnecting the blower with the air-conduits.

2. The combination of a furnace comprising a bridge-wall, a fire-box, acombustion-chamher, side walls having gas-conduits and intakes to thegas-conduits at the combustionchamber in rear of the bridge-wall,air-conduits located in the gas-conduits, and series of transverseinjectors connected with the air-conduits, a boiler having smoke-fines,a smoke-chain ber at the forward end of the boiler, vertical smoke-pipesconnecting the smoke chamber with the gas conduits, a blower and pipesconnecting the blower with the air-conduits.

3. The combination of a furnace comprising a bridge-wall, a fire-box, acombustion-chamber, side walls having upper and lower gasconduits andupper and lower intakes at the combustion-chamber, in rear of thebridgewall, air-conduits located in the gas-conduits, and series oftransverse injectors connected with the air-conduits, a boiler havingsmokefiues, a smoke-chamber at the forward end of the boiler, verticalsmoke-pipes connecting the smoke-chamber with the upper gas-conduits, ablower and pipes connecting the blower with the upper and lowerair-conduits.

THOMAS G. MAOY.

\Vitnesses:

WM. E. KNIGHT, J. GREEN.

